Underground most commonly refers to: Subterranea (geography), the regions beneath the surface of the Earth Underground may also refer to: Places Buenos Aires Underground, a rapid transit system L
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc70dc08ef04a6941557d057bbf457ce9f1a8ec1efb6545cf195834e82eb6f9. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c585e7e-4341-4d65-8f2e-3dda7a5a7cdb.json and https://artists.proofprofile.net/proofs/artist/6c585e7e-4341-4d65-8f2e-3dda7a5a7cdb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda7926ff5df1c0be6336e9272e33366e9a7db8e9d7e469a18dde2e70b409643. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b097da9be4f73f554dddd96ed64f81412bcfd7e428982db185482218cb3f0d. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ecba17a12a5384c867d600c42bafae789ce8173198fbc105731756e63e16935. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:15:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fd1d84e00fc2819f79a1ac70dcddd908a3c7ee068a097c9fd7b28fd0cf5cbf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dafa910ff362a92c767d17e4c57a6ef5f6c612308a389a9fb5d7826c19190d7. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f202edfd89261d2118bdee9a00ca88901832d0e1eb7960269cdea9fc6ab0f7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91699efaf1aa053cc62fe7bcb7bd6b6225de6b20ecfa0f9674ad9ce4dfc73e5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7M2473324.